Cross-weaving loom



A. E. STAFFORD CROSS WEAVING LOOM Filed Feb. 17. 1923 2 Sheeis-Sheei 1 ATTORNEY 31 5113184 A. E. STAFFORD GROS S WEAVING LOOM Filed Feb. 17, 1923 2 Shgets-Sheet. 2

Patented Oct. 7, 1924.

umrso STATES PATENT OFFICE.

ALFRED E. STAFFORD, or HOPEDALE, MASSACHUSETTS, ASSIGNOR 'ro 11mm COR- ronarron, or HOPEDALE, massacnosn'rrs, A oonronn'rron or MAINE.

CROSS-W'EAVING 1200M.

Application filed February 17, 1923. Serial No. 619,755.

To all whom it may concem:

Be it known that I, ALFRED E. STAFFORD,

a citizen of the United States, residing at Hopedale, in the county of IVorcester and 5 State of Massachusetts, have invented an Improvement in Cross-IVeaving Looms, of

which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to cross weaving looms in which certain of the Warp threads are crossed relative to others to produce a cross or marquisette weave.

In the patent to George E. Spofford, No. 1,439,029, dated December 19, 1922, a loom of this general type is shown and-described wherein lifter heddles and a jumper heddle are each given one movement during the 2 shedding operation by the c'ontractal force of springs attached to the heddles and to a fixed part of the loom. Inasmuch as the doup thread is to be crossed relative to the jumper thread when the shed is substantially closed, it is. desirable that the relative position of the threads be accurately positioned in the closed shed plane for the accomplishment of the crossing relation ofthe threads. The present invention therefore is a further development of the cross weaving loom shown and described in the Spofi'ord patent and has for its object the accurate control of the doup and jumper threads, to the end that'when they are brought into'the substantially closed shed plane the doup and'jumper threads may be properly positioned to effect their crossing relation on the subsequent formation of the shed.

In accordance with the present invention,

a doup heddle, two lifter heddles and a jumper heddle constitute a unit, and the lifter and jumper heddles are positively actuated in a two-to-one relation to always place the doup threads in the same plane of the shed and the jumper thread in the opposite plane of the shed on successive shed formations.

The invention and its various improved and novel features and the new combination of parts will best be made clear from the following description and the accompanying drawings of one good form of means for Earrying the invention into practical efect. 1

anism and its'operating means detached from the loom frame.

The loom frame 1 has mounted thereon the usual crank shaft 2 and an under or cam shaft 3 which are actuated in a twoto-one relation, that is, the crank shaft makes two revolutions to eachpne revolution of the under or cam shaft.

The doup-heddle, Fig. 2, comprises the two leg portions 4, each of which passes through a slot or opening in a lifter heddle 5, and at the junction of the legs 4 the doup heddle is provided with an eye 6 through which passes the doup thread a. The lower portions of the doup heddle are connected to the doup heddle depressing frame 7 which is itself provided with yokes 8 to the lower end portions of which are connected the springs 9 normally tending, in the present instance, to lower the doup heddles. v

The lifter heddles 5 are arranged in two sets for each doup heddle and the end portions of the lifter heddles 5 are connected to the associated lifter heddle frames 10. In the present instance the lifter heddles 5 are connected to their respective frames by the cross bars 11, the construction being such that when either of the lifter heddles is raised it will carry with it the associated doup heddle, substantially as shown and described in the Spofl'ord patent hereinbefore mentioned. a

In accordance with the present invention, the lifter heddles for controlling the doup heddle are positively raised and lowered to accurately position the doup thread a when the shed is closed and the doup and jumper threads are to be. crossed.

Each of the lifter heddle frames 10 is connected to an operating bar 12 by connections 13, and each of the bars 12 is operatively associated with an actuating lever 14 which may be conveniently mounted upon an axis or dead shaft 15 extending transversely of the loom.

The under or cam shaft 3 has mounted thereona series of cams 16 each of which operates one of the actuating levers"14, as

indicated in Fig. 2. In the present instance,

each of the levers 14 is provided with a roll 17 which rides upon the peripheral por tion of its associated cam 16 and each actuating lever is connected to the bar 12 of its associated lifter heddle frame by.

. and above theguide 20 the straps 19 are connected as at 22 to a single strap 23 which passes about a roll 24. The companion or associated lifter heddle frame is similarly provided with upwardly extending straps 25 which pass over the guides or pulleys 20 on the loom arch and are connected to the end 26 of the single stra being such that upon the depression ofeither lifter heddle b its actuating lever, the

. other lifter he dle will be caused to rise through the flexible connection or straps described.

In the present instance of the invention, four lifter heddle frames are "shown, but it will be understood that any suitable number of lifter heddle frames may be employed and that there will be associated with each,

two lifter heddle frames and lifter heddles a doup heddle. In accordance with themes ent invention, a pair of lifter heddle frames Where more than a single pair of lifter heddle frames are employed, they are actuated by levers and cams from the under or cam shaft substantially as already described for the lifter heddle frames 10. In the presi ent instance, however, where four lifter heddle frames are employed, the second pair of lifter heddle frames are connected b straps 27 and 28 to'a single-strap 29 of t e head motion which passes about a roller 30 in the present instance, so that upon the depression of either of thesecond pair of lifter heddle frames, the associated lifter heddle frame will be raised.

In order to provide for the'proper formation of the shed plane into which the doup threads 0 are moved, when a plurality of pairs of lifter heddle frames are employed, it is desirable to associate the overhead strap connections with the head motion by a compensating device, which in the present instance comprises the lever 31 pivotally mounted at 32 on a bracket 33 and carr ing at one end the roll 30. On a portion 0' the lever 31 at the opposite side of its pivotal mounting is another lever 34 which, in the present lnstance, carries the roll 24, about which passes the I strap connection to the be sufficient to 23, the construction front pair of lifter heddle frames, the construction being such that the amplitude of movement of the lifter heddle frames may place the doup threads in substantially a single plane when the shed is open and into substantially the closed shed plane when the shed is closed.

In accordance with the present invention, a jumper heddle is associated with each pair of lifter heddles and is given a two-to-one movement relative to the lifter heddles.

In the present instance the jumper heddle 35 is provided with an eye 36 through which passes the jumper thread I) and from the eye 36 the jumper thread passes between two of the lifterheddles 5, substantially as described in the patent to Spoiford hereinbefore mentioned. The jumper heddles are connected to the jumper heddle frame 37 by bars 38 to which the upper and lower ends of the jumper heddles are secured.

As hereinbefore indicated and as pointed out in the Sp'bfi'ord patent, the jumper heddle frame is given a tWo-to-one movement relative to the lifter heddle frames andin accordance with the present invention this movement of the jumper heddle frame is accomplished positively in both directions" crank 39, Fig. 1, to which is connected the and lifter heddles with the associated doup. (heddle and a jumper ,heddle ,constitute a v unit of the cross weaving mechanism.

invention the arm 41 is mounted on the axis 32 of the compensating device as a convene ient construction, but of course it may be mounted on a separate support if desired. Connected to the arm 41 is the transmitter 42 which may be conveniently formed as a segment mounted for rocking movement upon the axis 32 4 Secured to the transmitter 42 is a strap 43 which passes around a guide 44 mounted on a bracket 45 secured to the loom frame. At the lower part of the loom the strap 43 is divided into two operating members 46 and 47, the member 46 being passed about the guide'48 secured to a bracket 49 mounted on the loom frame and extended upwardly and secured to the lower portion of the jumper heddle frame. The-memben47 is extended laterally of the loom and passed around the-guide 50 mounted on the bracket 51 secured'to the loom frame and from' of the jumper heddle frame 37, the construction being such that when the crank shaft is rotated in its two-to-one relation with the under or cam shaft, the jumper heddle frame will be positively movedup and down to accurately place the jumper thread 6 in the closed shed plane and then move it from such plane to the under plane of the shed on successive shed formations.

The doup and jumper threads lead from a suitable source of supply, which in the present instance is the Warp beam 55, Fig. 1, from which the doup and-jumper threads pass over the whip roll 56 then frontwardly through the respective jumper and doup heddles.

Inasmuch as the doup threads will be slackened when they are moved to the closed shed plane to cross the jumper threads, the present invention provides an evener bar 57 which rests upon or above the doup threads at between the Warp beam and the shedding mechanism. In the present instance the evener bar 57 is normally under the influence of a spring 58 tending to lower the evener bar and, perforce, maintain the doup threads under suitable tension when the shed is closed. I I

To direct the movement of the evener bar as it is raised by the tension of thedoup threads and lowered under the dictates of the spring58, the end portions of the evener bar 57 are engaged in appropriate slots in the guides 59, one at each side of the loom.

It is usual in the marquisette weave to provide a selvage on each' side of the cloth by groupsof selvage threads and in the present instance of the invention the selvage threads 0 are supplied from overhead beams, passed about the whip roll 56 and through the appropriate selvage heddles 60, one of which is shown raised and the other lowered in Fig. l, but as the present invention is not particularly directed to the selvage formation further description of this feature is not deemed necessary.

From the construction.described and in accordance with the present invention it will be apparent that the lifter heddles and the jumper heddle will be positivel moved in both directions on successive s ed forma-' 'tions and that upon the formation of successive sheds the doup threads will be placed in the upper plane of the shed, in the present instance, and the jumper threads will be placed in the lower plane'of the shed. It will also be apparent that when the shed is substantially losed, the jumper and doup threads will be accurately positioned for the crossing of such threads on a following formation of the shed.

What is claimed is:

1. In a cross-weaving 106111, the combination of a doup heddle, two lifter heddles for controlling the doup heddle, a cam or under shaft having lifter heddle operating cams, connections between the two lifter heddles to cause movement of one to be transmitted to the other in the opposite direction, a jumper heddle, a flexible strap connected to by the crank shaft and acting through said flexible connection to impart positive movement to the jumper heddle.

2. In a cross-weaving loom, the combination of the crank-shaft, an under or cam shaft, a doup heddle for controlling a doup thread, cams on the cam shaft for operating the doup heddle for lacing the doup thread in the same plane of the shed on successive shed formations, a jumper heddle for controlling a jumper thread, and connections between the jumper-heddle and crank-shaft including a strap connected to the top and bottom of the jumper heddle for positively moving the jumper heddle in both directions and in a two-to-one relation with the doup thread operating means to place the jumper thread in the same plane of the shed on successive shed formations.

3. In a cross-weaving loom, the combination of the crank-shaft, an under or cam shaft, a doup heddle for controlling a doup thread, means including cams on the under or cam shaft levers actuated b the cams on the under shaft and connected to the doup heddle for placing the doup thread in the same plane of the shed on successive shed-- formations, a jumper heddle for controlling a jumper thread, a transmitter connected to the top and bottom of the jumper heddle and actuated from the crank-shaft in a twoto-one relation withthe doup thread operating means to place the jumper thread in the same plane of the shed on successive shed formations.

4. In a cross-weaving loom,'the combination of the crank-shaft, an under or cam shaft, a doup heddle for controllin a doup thread, means including cams on the under or cam shaft and two lifter heddles connected to the doup heddle for lacing the doup thread in the same plane 0 the shed on successive shed formations, a jumper heddle for controlling a jumper thread, a transmitter, a strap secured to the transmitter and connected to the top and bottom of the jumper heddle and actuated from the crank-shaft in a two-to-one relation with the doup thread the upper-and lower portion of the-jumper heddle, a crank shaft, and means operated.

from the crank-shaft, and connections between the transmitter and the top and bottom of the jumper heddle and between the transmitter and the crank-shaft for raising doup thread and placing it in the same planeof the shed on successive shed formations, an

evener bar which rests upon the doup threads, a jumper heddle for controlling a jumper thread, a transmitter positively actuated from the crank-shaft, and connections between the transmitter and the top and bottom of the jumper heddle for raising and lowering the jumper thread positively to place the jumper thread in the same shed on I successive shed formations.

7. In a cross-weaving loom, the combination of two lifter heddles, overhead connections between the two causing movement of one lifter heddle to be transmitted to the other in an opposite direction, a dou heddle controlled by the two'lifter heddles, an under or'cam shaft, .treadles actuated thereby and one connected to each lifter heddle,'a

jumper heddle, a head motion device con nected to the top and bottom of the"ju"m'per heddle, a crank shaft having a crank connected to and for'operating the head motion lli a two-to-one relation with the lifter hedd es.

8. In a cross-weaving loom, the combination of a crank-shaft, an under. or cam shaft, a doup heddle for controlling a doup thread, two lifter heddles for alternately lifting the doup heddle, cams on the cam shaft and levers operated by the cams for raising and loweringthe lifter'heddles, a junmper hed dle forfcont'rolling a jumper'thread', and means including a head motion and transmitter -secured thereto and to the top and bottom of the jumper heddle and actuated from the crank-shaft for positively raising and positively lowering the jumper heddle that the jumper heddle may be given two movementsto each single movement of the lifter heddles.

9. In a cross-weavin loom, the combination of the crank-sha the under or cam shaft making one revolution to each two revolutions of the crank-shaft, a doup heddle, two lifter heddles for alternately o crating the doup heddle to place the doupt read in the same plane of-the shed on each shed formation, cams on the camshaft, levers operated by the cams and one connected to each 11fter heddle, a jumper heddle, a flexible connection connected to the top and bottom of the jumper heddle, a transmitter secured to the flexible connection, a rod connecting the transmitter tothe crank-shaft to impart a two-to-one operation of the jumper heddle relative to the lifter heddles to place the jumper thread in the same plane of the shed on successive shed formations.

1'0. In a cross-weaving loom, the combination of the crank-shaft, the under or cam shaft, a doup heddle controlling a doup thread, two lifter heddles for alternately lifting the doup heddle, shed forming mechanism for ositively operating the lifter heddles in both directions to place the doup thread in the same plane of the shed on successive shed formations, a jumper heddle, shed forming mechanism connected to the jumper heddle for positively operating it in both directions to place the jumpeTthread in the same plane of the shed in successive shed formations, means connected to the under or cam shaft for operatingthe lifter heddle shed'forming mechanism, and meansconnected to the crank-shaft for operating the jumper heddle shedding mechanism in a two-to-one relation with the lifter heddle shed forming mechanism;

In testimony whereof, I have signed my name to this specification.

ALFRED E. STAFFORD. 

